But a number of Instagram users, including critics, architects, and curators, have been given access to the interior during the transition and have shared images of the museum's lobby lighting, concrete staircases, trapezoidal windows, and other distinctive features.

Considered a masterwork of the mid-century Brutalist style, typified by the use of raw concrete, the Breuer building has a top-heavy profile of cantilevered floors stacked above a sunken courtyard. The main entrance is accessed by a bridge.

The first exhibitions in the space will be Unfinished: Thoughts Left Unfinished, a group exhibition questioning the idea of completeness in art, and Nasreen Mohamedi, a survey of work of the Indian abstract artist.

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